Radiotelephone with handset talking function and hand-free talking function
First Claim
1. A hand-held radiotelephone connected via a radio channel to a base station, comprising:
- a microphone for producing a speech signal corresponding to a user'"'"'s utterance;
first level varying means, connected to said microphone, for varying the level of the speech signal from the microphone to produce a level-varied speech signal;
modulating and transmitting means, connected to said first level varying means, for modulating a carrier signal according to the level-varied speech signal and transmitting the modulated carrier signal via said radio channel to said base station;
receiving and demodulating means for receiving a carrier signal from said base station via said radio channel and demodulating the received carrier signal into a received speech signal;
second level varying means, connected to said receiving and demodulating means, for varying the level of the received speech signal to produce a level-varied received speech signal;
a speaker connected to said second level varying means, for producing a voice signal corresponding to the level-varied received speech signal;
speech-mode setting means for setting a speech mode to either handset speech mode or a hand-free speech mode; and
control means for controlling variable level of said first level varying means and said second level varying means according to the speech mode set by said speech-mode setting means.
1 Assignment
0 Petitions
Accused Products
Abstract
A radiotelephone of this invention comprises a sending-speech level varying circuit for varying the level of the sending-speech signal from the microphone and supplying the resulting signal and receiving-speech level varying means for varying the level of the receiving-speech signal demodulated by receiving means and supplying the resulting signal to the speaker, as well as a talking-mode setting section and a gain control circuit. At the talking-mode setting section, either the handset talking mode or the hand-free talking mode is set. At the gain control circuit, the gains of the sending-speech level varying circuit and receiving-speech level varying circuit undergo variable control according to the talking mode set by the talking-mode setting section. The gain control is carried out in such a manner that the gain becomes a first specific value when the handset talking mode has been set, and a second specific value larger than the first value when the hand-free talking mode has been set.
31 Citations
29 Claims
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1. A hand-held radiotelephone connected via a radio channel to a base station, comprising:
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a microphone for producing a speech signal corresponding to a user'"'"'s utterance; first level varying means, connected to said microphone, for varying the level of the speech signal from the microphone to produce a level-varied speech signal; modulating and transmitting means, connected to said first level varying means, for modulating a carrier signal according to the level-varied speech signal and transmitting the modulated carrier signal via said radio channel to said base station; receiving and demodulating means for receiving a carrier signal from said base station via said radio channel and demodulating the received carrier signal into a received speech signal; second level varying means, connected to said receiving and demodulating means, for varying the level of the received speech signal to produce a level-varied received speech signal; a speaker connected to said second level varying means, for producing a voice signal corresponding to the level-varied received speech signal; speech-mode setting means for setting a speech mode to either handset speech mode or a hand-free speech mode; and control means for controlling variable level of said first level varying means and said second level varying means according to the speech mode set by said speech-mode setting means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A radiotelephone system comprising:
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a base station connected to a communication network via a wire channel; and a hand-held radiotelephone connected to said base station via a radio channel;
whereinsaid hand-held radiotelephone comprises; a microphone for producing a speech signal corresponding to a user'"'"'s utterance; first level varying means, connected to said microphone, for varying the level of the speech signal from the microphone to produce a level-varied speech signal; modulating and transmitting means connected to said first level varying means, for modulating a carrier signal according to the level-varied speech signal and transmitting the modulated carrier signal via said radio channel to said base station; receiving and demodulating means for receiving a carrier signal from said base station via said radio channel and demodulating the received carrier signal into a received speech signal; second level varying means, connected to said receiving and demodulating means, for varying the level of the received speech signal to produce a level-varied received speech signal; a speaker, connected to said second level varying means, for producing a voice signal corresponding to the level-varied received speech signal; speech-mode setting means for setting a speech-mode to either a handset speech mode or a hand-free speech mode; and control means for controlling a variable level of said first level varying means and said second level varying means according to the speech mode set by said speech-mode setting means; and wherein a sending and receiving speech path including said hand-held radiotelephone and said base station is provided with an echo canceler for canceling an echo signal corresponding to an acoustic echo generated at least between the speaker and the microphone of said hand-held radiotelephone. - View Dependent Claims (16, 17)
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18. A hand-held radiotelephone connected to a base station via a radio channel, comprising:
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a microphone for producing a speech signal corresponding to a user'"'"'s utterance; first level varying means, connected to said microphone, for varying the level of the speech signal from the microphone to produce a level-varied speech signal; modulating and transmitting means, connected to said first level varying means, for modulating a carrier signal according to the level-varied speech signal and transmitting the modulated carrier signal via said radio channel to said base station;
receiving and demodulating means for receiving a carrier signal from said base station via said radio channel and demodulating the received carrier signal into a received speech signal;second level varying means connected to said receiving and demodulating means, for varying the level of the received speech signal to produce a level-varied received speech signal; a speaker, connected to said second level varying means, for producing a voice signal corresponding to the level-varied received speech signal; speech-mode setting means for setting a speech mode to either a handset speech mode or a hand-free speech mode; switching means for selectively switching between at least a first state and a second state; space-mode setting means for setting a using space mode to either a first space mode corresponding to a space in a car when said switching means is in the first state or a second space mode corresponding to a space larger than the space in a car when said switching means is in the second state; and control means for controlling a variable level of said first level varying means and said second level varying means according to the speech mode set by said speech-mode setting means and the using space mode set by said space-mode setting means. - View Dependent Claims (19, 20, 21)
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22. A hand-held radiotelephone apparatus connected to a base station via a radio channel comprising:
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a radiotelephone; and a fixing member for detachably fixing said radiotelephone in a car to enable hand-free talking;
whereinsaid radiotelephone comprises; a microphone for producing a speech signal corresponding to a user'"'"'s utterance; first level varying means, connected to said microphone, for varying the level of the speech signal from the microphone to produce a level-varied speech signal; modulating and transmitting means, connected to said first level varying means, for modulating a carrier signal according to the level-varied speech signal and transmitting the modulated carrier signal via said radio channel to said base station, receiving and demodulating means for receiving a carrier signal from said base station via said radio channel and demodulating the received carrier signal into a received speech signal; second level varying means connected to said receiving and demodulating means, for varying the level of the received speech signal to produce a level-varied received speech signal; a speaker, connected to said second level varying means, for producing a voice signal corresponding to the level-varied received speech signal; speech-mode setting means for setting a speech mode to either a handset speech mode or a hand-free speech mode; judging means for judging whether or not said radiotelephone is fixed by said fixing member; space-mode setting means for setting a using space mode to a first space mode corresponding to a space in a car when the judging means has judged that the radiotelephone is fixed by said fixing member and setting the using space mode to a second space mode corresponding to, a space larger than the space in a car when said judging means has judged that said radiotelephone is not fixed by said fixing member; and control means for controlling a variable level of said first level varying means and said second level varying means according to the speech mode set by said speech-mode setting means and the using space mode set by said space-mode setting means. - View Dependent Claims (23)
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24. A radiotelephone system comprising:
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a base station connected to a communication network via a wire channel; and a hand-held radiotelephone apparatus connected to said base station via a radio channel;
whereinsaid hand-held radiotelephone apparatus comprises a radiotelephone and a fixing member for detachably fixing the radiotelephone in a car to enable hand-free talking, said radiotelephone comprising; a microphone for producing a speech signal corresponding to a user'"'"'s utterance; first level varying means, connected to said microphone, for varying the level of the speech signal to produce a level-varied speech signal; modulating and transmitting means, connected to said first level varying means, for modulating a carrier signal according to the level-varied speech signal and transmitting the modulated carrier signal via said radio channel to said base station; receiving and demodulating means for receiving a carrier signal from said base station via said radio channel and demodulating the received carrier signal into a received speech signal; second level varying means, connected to said receiving and demodulating means, for varying the level of the received speech signal to produce a level-varied received speech signal; a speaker, connected to said second level varying means, for producing a voice signal corresponding to the level-varied received speech signal; speech-mode setting means for setting a speech mode to either a handset speech mode or a hand-free speech mode; judging means for judging whether or not said radiotelephone is fixed by said fixing member; space-mode setting means for setting a using space mode to a first space mode corresponding to a space in a car when the judging means has judged that the radiotelephone is fixed by said fixing member, and setting the using space mode to a second space mode corresponding to a space larger than the space in a car when said judging means has judged that said radiotelephone is not fixed by said fixing member; and control means for controlling a variable level of said first level varying means and second level varying means according to the speech mode set by said speech-mode setting means and the using space mode set by said space-mode setting means; and wherein a sending and receiving speech path including said hand-held radiotelephone apparatus and said base station is provided with an echo canceler for canceling an echo signal corresponding to an acoustic echo generated at least between the speaker and microphone of said hand-held radiotelephone. - View Dependent Claims (25, 26)
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27. A radiotelephone system comprising:
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a base station connected to a communication network via a wire channel; a hand-held radiotelephone connected to said base station via a radio channel, said hand-held radiotelephone comprising; a microphone for producing a speech signal corresponding to a user'"'"'s utterance; first level varying means, connected to said microphone, for varying the level of the speech signal from the microphone to produce a level-varied speech signal; modulating and transmitting means connected to said first level varying means, for modulating a carrier signal according to the level-varied speech signal and transmitting the modulated carrier signal via said radio channel to said base station; receiving and demodulating means for receiving a carrier signal from said base station via said radio channel and demodulating the received carrier signal into a received speech signal; second level varying means, connected to said receiving and demodulating means, for varying the level of the received speech signal to produce a level-varied received speech signal; a speaker, connected to said second level varying means, for producing a voice signal corresponding to the level-varied received speech signal; speech-mode setting means for setting a speech-mode to either a handset speech mode or a hand-free speech mode; and control means for controlling a variable level of said first level varying means and said second level varying means according to the speech mode set by said speech-mode setting means; and an echo canceler, provided in at least one of said hand-held radiotelephone and said base station, for canceling an echo signal corresponding to an acoustic echo generated at least between the speaker and the microphone of said hand-held radiotelephone. - View Dependent Claims (28, 29)
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Specification